Packet8

http://www.packet8.net/

Offers voice and video SIP based services.

Local Number Portability support? - yes, but a bit tentative.

Packet 8 recently replaced their DTA310 with a newer model BPA410 that supports two lines. The BPA410 is an OEM branded Leadtek Research BVA8052D
A minimum bill price is around $20.50 a month. Packet8 investiages accounts with a useage over 3000-4000 min.

Reviews can be found here
Packet8 Forum

See Also

8x8